wait for and read a response.
Leaves result in lastResponse (ascii) and lastReplyCode (numeric).
MultiLine responses are collected in responseLines.
Finally, handleReplyCode (redefinable) is asked to xlate from response code to
exception (if any)

wait for and read a response.
Leaves result in lastResponse (ascii) and lastReplyCode (numeric).
MultiLine responses are collected in responseLines.
Finally, handleReplyCode (redefinable) is asked to xlate from response code to
exception (if any)